RtsFlags.c: Const correct fixes

Authored by erikd on May 28 2016, 4:26 PM.

Description

RtsFlags.c: Const correct fixes

Test Plan: validate

Reviewers: hvr, austin, simonmar, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2275

Details